Cutter-grinding attachment



'Nov. 6-, 1923.

A. W. ERDMAN CUTTER GRINDING ATTACHMENT Filed March 1. 1921 2 Sheets-Sheet 1 Nov, 6 1923. 1,472,327 A. w. ERDMAN CUTTER GRINDING ATTACHMENT Filed March 1. 1921 2 She ts-Sheet 2 aa wentoz am w 5001mm Hartforcl, is the cient'ly',lmu's't frequently i eteriieti'hloa. 3923 a eaeir Ai een-2r w, ERDIEAN, or HARTFORD, conn'scmonw, Assiozaoa To Pears e WEi'EHEY COMPANY, 01" NEW roan, a. a coeieoaatrxon ca new GUTTER-GRIIH3IHG ATTACHMENT.

application sea amen i, 1921. Serial no. cease To a2? whom it may concern:

Be it known that I, ALBERT W. ERDMAN, a citizen of the United States, residing at county of Hartford and State of Connecticut, have invented certain new and useful improvements in (lottery rinding Attachments, of which the following is a specification.

This'invent ion relates to cutter grinding machines and particularly to a simple attachment whereby cutters ha ling longitudinally extending teeth either of a straight, angular or spiral configuration may be ground with little or no change in the ma chine. The primary object of the invention t provide a. simple means for performmg such function, the said'means being in the form of an attachment adapted to be mounted on the centers of a grinding mahine or of a. machine adapted to have a rind-ingwheel mounted thereon.

Other and more specific objects of the invent/ion will appear as the description proseeds.

Referring to the figures of the drawings: Figure. l is a partial side elevation of a machine showing the invention applied thereto 2 is a cross section through tl'iearhor --snd cam member, taken on line 2 2 ct 3 is an enlarged. detail View similar L 1 and showing a portion thereof in iongitiuimai section.

Fig. is an end View showing the M1935 ing mechanism.

Fig. 0 is a. View similar to Fig. 4 but sliowing the cam mem'hcr in another position. Fig. 6 is a cross section on line 6-6 of Fig.

Fig. 7 is a cross section on line 77 of l i2. 3.

Fig. 8 is iagrammatic View showing the cam member pread out fiat.

A. milling atter, to operate most efiiened and a sp 'al machine for performing such functions. phrticuiariy for grinding cut ters having angulsrly or spirally arranged teeth. is. ratherv 8XpCI1S1'W"i'0T small shops. The present invention aims to provide a be ground or sharpsimple and inexpensiveattacnment for performing this function, the attachment being ground. By means of a. finger engaging in this groove. the cutter is given a rotary movement to keep the tooth being ground accurately in contact with the grindingwheel as the cutter is moved past the "wheel.

Preferably a plurality of relatively angular grooves are provided in the cam whereby the same cam may be used to guide differentcutters having teeth of .arying shapes longitudinally. The details of the invention, including: the means for indexing" the cutter,

will no he n'lore specifically described.

1 rein'csents the base oi a grinding or other machineon which mounted a reciprocating slide 2. A grinding wheel 3 is sup-- ported on an upright a. on the base and is illustrated aiig ularly adjustable on the.

at A. pair of standards 6 and T, suppol'ti o centers and therein, are mounted on the slide. The greater portion of the iiiYtl .771 per se. which is now to be de sc'ted is adapted to he mounted with the cutter on these centers as illustrated in his. 3.

The arbor, mounted hetwm-n the centers adjacent a flange 15 on the mandrel and'a nut 16 thereon. When 'itaisf desired to-"grindl a shanked cutter, the cutter shank is secured in the socket of mandrel 11.

Themhaft 10 is threaded atits .endsand is provided with a flange adjacent'one end' thereof. The cam member 18 is mounted on this she it, as illustrated in Fig. 3. The 'meim the, shaft 10 in place. (seam-j and 9 and adapted to support th cam her is socketed at its fdrward end and abuts against the'fiange 17 which is held between a friction washer 19 and the cam by means of a nut 20.. The shaftextends through a bushing 21 secured to the rear end of the cam by means of a set screw 22. A second bush; ing 23 is mounted on an extending portion 21 'of the bushing 21 andan indexing wheel 24 is pinned to the shaft adjacent the rear end thereof. A nut 25 on the shaft secures all the said parts together on the shaft.

The bushing 23 is rotata'bly adjustable on the extension 21 by means of a worm 26 engaging worm teeth 27 in the said extension. The worm may be rotated by means of a knurled head 28. Since the extension 21 and the "bushing 23 are secured respectively to the'cam 18 and the arbor shaft 10, rotation of the head 28 rotates one of these members relative to the other. This mechanism provides a fine feeding adjustmentbe tween-the cutter and its guidingcam member 18. A portion 23 of the bushipg 23 is split and is provided with a. clamping screw 29 whereby the bushing may be securely clamped in adjusted position on the. extension 21*.

The indexing mechanism for cooperating with the index wheel 24: is carried by a lateral extension 30 on the bushing 23. A1 plunger 31 havin r an operating head 32 thereon is mounted in a radially extending bore in the extension 30. A spring 33 surrounds the plunger and is adapted to normally hold the same in engagement with the wheel 24. The wheel is provided with spaced notches 24 into which the plunger is adapted to enga e.

The cam mem r 18 is "provided with one or more grooves 34 adapted to cooperate with a finger 35 to rotate the arbor and'cutter as the same is reciprocated. The longitudinal configuration or shape of such groove is the same as that of the teeth of the cutter it is desired to grind. By providing the cam member with a. plurality of relatively angular grooves, as illustrated in Fig. 8. as many cutters having teeth of the shape of such grooves may be ground by the use of the one cam member. It should be understood that a cam groove is selected which corresponds in longitudinal configuration or lead to the longitudinal configuration of the cutter teeth to be ground. The finger 35 is supported on a holder 36 vertically adjustably mounted in an arm 37. The arm 37 is longitudinally adjust-ably mounted in a bracket 38 on the base of the machine. Screws 39 and 40 serve to secure the holder 36 and arm 37 in place.

In operation, the mechanism is set up as illustrated in the drawings. -The proper cam groove 34 is selected and .cngaged with the finger 35 as illustrated in Figs. 1 and 2. The plunger 31 is engaged in one f the notches 24 in the index wheel -24 and the.

cutter is then adjusted by means of t'he "l worm 26 to bring a tooth thereof into grind ing contact with the grinding wheel. "The slide 2 is now reciprocated to move-the cutter past the grinding wheel being the same as that of the cam" groove engaged by the finger, it is evident that the cutter tooth being groundwill be held in accurate contact with the grinding wheel throughout the entire reciprocation and length of the tooth. The indexing mechanism is adapted to be operated by hand to bring each tooth of the cutter successively into grinding relation with the grinding wheel, it being understood that the index wheel has as many notches therein or a. multiple thereof as the cutter has teeth.

W'hat I claim is.

1. An attachment for a grinding milling cutters comprising in combination, an arbor adapted to be mounted on a. pair of centers, one portion of the arbor being adapted to support a milling cutter thereon, a cam member on another portion of the arbor provided with a plurality of longitudinally extending cam shoulders thereon, the sai shoulders being relatively angular and being dapted to optionally cooperate with a stop Element to accurately position the cutter during the grinding operation, mechanism for rotatably indexing the member through a definite angle on the arbor, other mechanism for finely rotatably .adjusting the member-on the arbor. and clamping means for securing the member to the arbor.

2. An attachment for grinding milling cutters comprising in combinatioman arbor during which operation the operator holds the cam groove in engagement with the finger. The longi tudinal contour or lead of the cutter teeth adapted to be mounted on a pair of centers, 4

one portion of the arbor being adapted to support a milling cutter thereon, a cam member on another portion of the arbor pro rided with a longitudinally extending cam shoulderthereon corresponding in shape to the teeth of the milling cutter it is desired to grind. the shoulder being adapted to cooperate with a stop element to accurately position the cutter during the grindin operation, mechanism including a notche disk on the arbor for rotatably indexing the member through a definite angle onthe arbor. a worm and worm wheel for finely adjusting the member on the arbor, and claw ing means for securing the member to tl ie arbor.

3. An attachment for grinding milling cutters comprising in combination, on arbor adapted to be mounted on apair at centers, one portion of the arbor being adapted to support amilling cutter thereon, a cam member on another portion of'the arbor provided with a. plurality of 1011 ftudinally ing adapted to optionall stop element to accurate 5 ter durin the ni f0 tending cam shoulders thereon the said oulders being relatively angular and becooperate with a a grinding operation, mechasm including a notched disk on the arbor r rotatably indexing the member through y position the anti a definite angle on the arbor, and a worm and worm wheel for finely rotatalbly adjusting the member on the arbar.

v10 In testimony whereof, I hereto eflix my signature.

ALBER W. ERDMAN; 

